ul{
    list-style: none;
    display: flex;
    margin: 0;
    padding: 0;

}
ul li{
    margin:  0 5px;
}
.box{
    background-color: aqua;
    display: none;
    width: 100%;
    height: 200px;
}
.box1{
    display: block !important;
}
.ac{
    background-color: aqua;
}